Rotational Molding worked example

Finished Part Cost at 58% cost capture and allocation factor: a worked example

This worked example runs the finished part cost numbers for a tougher week than the baseline: 58% cost capture and allocation factor instead of the typical 80%. Finished Part Cost rolls the resin, energy, labor, and fixed setup charges of a rotomolding run into a single defensible per-piece number.

The inputs for this scenario

  • Parts in the costed run: 100 units (held at the documented default)
  • Variable cost per part (resin, energy, labor): 45 $ / unit (held at the documented default)
  • Cost capture / allocation factor: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed run cost (setup, mold, tooling): 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Finished Part Cost cost = quantity × rate × capture factor + fixed cost.
  • Weighted cost works out to 2,860 $ at these inputs, and this is the headline figure for the scenario.
  • Per piece value works out to 28.6 $ / piece at these inputs.
  • Captured value works out to 2,610 $ at these inputs.
  • Fixed adjustment works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where cost capture and allocation factor sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • Use it when quoting a rotomolded part or checking whether a completed run recovered its full cost. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Weighted cost: 2,860 $ (headline result)
  • Per piece value: 28.6 $ / piece
  • Captured value: 2,610 $
  • Fixed adjustment: 250 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Finished Part Cost calculator, set cost capture and allocation factor to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.